131220147 has 4 divisors (see below), whose sum is σ = 174960200. Its totient is φ = 87480096.

The previous prime is 131220143. The next prime is 131220149. The reversal of 131220147 is 741022131.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 131220147 - 2² = 131220143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131220143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21870022 + ... + 21870027.

It is an arithmetic number, because the mean of its divisors is an integer number (43740050).

Almost surely, 2^131220147 is an apocalyptic number.

131220147 is a deficient number, since it is larger than the sum of its proper divisors (43740053).

131220147 is an equidigital number, since it uses as much as digits as its factorization.

131220147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43740052.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 131220147 is about 11455.1362715596. The cubic root of 131220147 is about 508.1596453519.

Adding to 131220147 its reverse (741022131), we get a palindrome (872242278).

The spelling of 131220147 in words is "one hundred thirty-one million, two hundred twenty thousand, one hundred forty-seven".